| 摘要 |
At least three light beams are applied to different positions on an optical element to be measured. The light beams coming via the optical element to be measured are received through a light-receiving lens by a two-dimensional light position detecting system provided at the rearward focus position of the light-receiving lens or at a position conjugate therewith or are received by two-dimensionally disposed light position detecting system. Three deviation vectors are detected and the refractive powers in three meridian directions are detected, or at least five light beams are applied to different positions on an optical element to be measured and from five deviated beam positions, a general elliptical curve coupling them is specified, whereby the degree of astigmatism, the direction of astigmatism and the refractive power are calculated.
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